Automatically wrapping a primitive type in a wrapper class object. For instance if you try to add an int value to a list, it will automatically be converted to an Integer object.
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Abstract Method
A method that only has a declaration and no method body (no code inside the method).
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ArrayList
An ArrayList can hold many objects of the same type. It can grow or shrink as needed. You can add and remove items at any index.
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Add
You can add an object to the end of a list using listName.add(obj). You can add an object at an index of a list using add(index,obj). This will first move any objects at that index or higher to the right one position to make room for the new object.
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Declaration
To declare an ArrayList use ArrayList
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Creation
To create an ArrayList use new ArrayList
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Get
To get an object at an index from a list use listName.get(index).
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Index
You can access and set values in a list using an index. The first element in a list called list1 is at index 0 list1.get(0). The last element in a list is at the length minus one - list1[list1.size() - 1].
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Remove
To remove the object at an index use ListName.remove(index). This will move all object past that index to the left one index.
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Set
To set the value at an index in a list use listName.set(index,obj).
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Size
Use listName.size() to get the number of objects in the list.
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Wrapper Class
Classes used to create objects that hold primitive type values like Integer for int, Double for double and Boolean for boolean.
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Unboxing
Automatically converting a wrapper object like an Integer into a primitive type such as an int.
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